Keep your sail protected from the suns UV rays when not using your mainsail instead of packing it away everytime. Easily placed over the top of the flaked mainsail. With a zipped section around the mast for tidyness and ease. Then just clip underneath the boom with bungy and hooks or side release buckles if requested.
Jazz up your Sail Coat or Boom Cover with your boat name sewn on the sides or even your website address.